How are nested plants organized?

A plant always operates in one of the following modes:

• Normal mode with plant operating mode "Off" or "On"
• Exception mode with plant operating mode "Off" or "On"

Normal mode

The following figure shows the signal flow for the "Normal" mode at plant level:

The following figure shows the signal flow for the "Normal" mode in the nested chart "Outside air damper":

Exception mode

The following figure shows the signal flow for the "Exception" mode at plant level, when the reason for exception is caused by the "Outside air damper":

The following figure shows the signal flow for the "Exception" mode in the nested chart "Outside air damper", when the reason for exception is caused inside the chart:

The following figure shows the signal flow for the "Exception" mode at plant level, when the reason for exception is caused by another component (not the "Outside air damper"):

The following figure shows the signal flow for the "Exception" mode in the nested chart "Outside air damper", when the reason for exception is caused by another component (not the "Outside air damper"):

Special exception mode "Smoke extraction" for air handling units

The following figure shows the signal flow for the "Exception" mode at plant level in case of "Smoke extraction":

The following figure shows the signal flow for the "Exception" mode in the nested chart "Outside air damper" in case of "Smoke extraction":